Featured Research

from universities, journals, and other organizations

Seeing the invisible: New 'CSI tool' visualizes bloodstains and other substances

Date:
December 10, 2010
Source:
American Chemical Society
Summary:
Snap an image of friends in front of a window curtain and the camera captures the people -- and invisible blood stains splattered on the curtain during a murder. Sound unlikely? Chemists are reporting development of a camera with that ability to see the invisible, and more. Called multimode imaging in the thermal infrared, the new technology could find uses in crime scene investigations and elsewhere, they say.

Snap an image of friends in front of a window curtain and the camera captures the people -- and invisible blood stains splattered on the curtain during a murder. Sound unlikely? Chemists from the University of South Carolina are reporting development of a camera with that ability to see the invisible, and more.

Called multimode imaging in the thermal infrared, the new technology could find uses in crime scene investigations and elsewhere, they say in a series of three reports in ACS' Analytical Chemistry.

Michael Myrick, Stephen Morgan and their graduate student colleagues explain that the luminol test (mainstay method for detecting blood stains and other body fluids at crime scenes) has certain disadvantages. Luminol, for instance, is potentially toxic; has been reported to dilute blood solutions below DNA detection limits; can smear informative blood spatter patterns; and can provide false positive results.

In the reports, the scientists describe the construction and successful testing of a camera that takes images in several different ways. It captures hundreds of images in a few seconds, while illuminating its subjects with pulses of invisible infrared light waves. Some of these photos are taken through special filters, which block out particular wavelengths, allowing certain chemical components to stand out from their surroundings. The camera detects blood diluted to as little as one part blood in 100 parts water. In tests, the camera was able to make invisible stains and patterns emerge from a background of four different types of fabric, also distinguishing between blood, household bleach, rust, soda pop, and coffee. The camera also successfully detected an invisible watermark that the team printed on a piece of fabric.

"These results indicate that this system could be useful for crime scene investigations by focusing nondestructive attention on areas more likely to be suitable for further analysis," the report states.

The authors acknowledged funding from the National Institute of Justice.


Story Source:

The above story is based on materials provided by American Chemical Society. Note: Materials may be edited for content and length.


Journal References:

  1. Heather Brooke, Megan R. Baranowski, Jessica N. McCutcheon, Stephen L. Morgan, Michael L. Myrick. Multimode Imaging in the Thermal Infrared for Chemical Contrast Enhancement. Part 1: Methodology. Analytical Chemistry, 2010; 82 (20): 8412 DOI: 10.1021/ac101109w
  2. Heather Brooke, Megan R. Baranowski, Jessica N. McCutcheon, Stephen L. Morgan, Michael L. Myrick. Multimode Imaging in the Thermal Infrared for Chemical Contrast Enhancement. Part 2: Simulation Driven Design. Analytical Chemistry, 2010; 82 (20): 8421 DOI: 10.1021/ac101108z
  3. Heather Brooke, Megan R. Baranowski, Jessica N. McCutcheon, Stephen L. Morgan, Michael L. Myrick. Multimode Imaging in the Thermal Infrared for Chemical Contrast Enhancement. Part 3: Visualizing Blood on Fabrics. Analytical Chemistry, 2010; 82 (20): 8427 DOI: 10.1021/ac101107v

Cite This Page:

American Chemical Society. "Seeing the invisible: New 'CSI tool' visualizes bloodstains and other substances." ScienceDaily. ScienceDaily, 10 December 2010. <www.sciencedaily.com/releases/2010/11/101110123943.htm>.
American Chemical Society. (2010, December 10). Seeing the invisible: New 'CSI tool' visualizes bloodstains and other substances. ScienceDaily. Retrieved September 1, 2014 from www.sciencedaily.com/releases/2010/11/101110123943.htm
American Chemical Society. "Seeing the invisible: New 'CSI tool' visualizes bloodstains and other substances." ScienceDaily. www.sciencedaily.com/releases/2010/11/101110123943.htm (accessed September 1, 2014).

Share This




More Health & Medicine News

Monday, September 1, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

Get on Your Bike! London Cycling Popularity Soars Despite Danger

Get on Your Bike! London Cycling Popularity Soars Despite Danger

AFP (Sep. 1, 2014) Wedged between buses, lorries and cars, cycling in London isn't for the faint hearted. Nevertheless the number of people choosing to bike in the British capital has doubled over the past 15 years. Duration: 02:27 Video provided by AFP
Powered by NewsLook.com
We've Got Mites Living In Our Faces And So Do You

We've Got Mites Living In Our Faces And So Do You

Newsy (Aug. 30, 2014) A new study suggests 100 percent of adult humans (those over 18 years of age) have Demodex mites living in their faces. Video provided by Newsy
Powered by NewsLook.com
Liberia Continues Fight Against Ebola

Liberia Continues Fight Against Ebola

AFP (Aug. 30, 2014) Authorities in Liberia try to stem the spread of the Ebola epidemic by raising awareness and setting up sanitation units for people to wash their hands. Duration: 00:41 Video provided by AFP
Powered by NewsLook.com
California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

California Passes 'yes-Means-Yes' Campus Sexual Assault Bill

Reuters - US Online Video (Aug. 30, 2014) California lawmakers pass a bill requiring universities to adopt "affirmative consent" language in their definitions of consensual sex, part of a nationwide drive to curb sexual assault on campuses. Linda So reports. Video provided by Reuters
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:
from the past week

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins